I have a pair of MDR-V6 and they used to not hiss when I'd listen to music in foobar or watch movies in MPC-HC. I don't know what happened but now suddenly, and only on my pc, my headphones hiss. If I move the plug to the rear jack, the hiss is still there. I don't know what happened or what caused this but the last thing I remember installing was Visual C++ and Windows SDK. Does anyone know what to do about this? I tried using a different OS (Fedora) and the hissing is still there so I doubt it's from an installed program. It just started hissing and I don't know why. Edit: I don't even have to listen to music. Just plugging the headphones in and listening to nothing you can hear hiss. This used to not exist but now it does.